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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2857231f625509effaa8350d87db1c3f6cbb28f09b711d43b8d952b7d06ddb1b' 
  AND token = 'aYskD9qtTEcb4Bh1oJvuXjPF54xpfeoJmk/gI/r833s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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