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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71b2a7c9a0db6505323d126fba6ec98164d1c22e7e2eab94cb947db67eef47c' 
  AND token = 'xWkt026B9DcJoWdJoHtoNFc6kG1f6FxM3xkamSPpwbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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