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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82942637de19fec59085769ac27f5bafef4059aa878c649ccef452e9f97e21de' 
  AND token = '10NX4aw1DxJZhgSSqwmIZqq84Vj0M3ZdCDiaf2lkOMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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