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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7123fcb8731d6d29b212a69512f9a0950c84b2f1120bb726fee81f5b082114f9' 
  AND token = 'pDEH5rE2fvAAndL8EqI4iv3nNDTm1SWex36vQeO6MG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}