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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d628f245952f30f72d50a62ba4a0af7ce2dc145ca25a0e48fb4f0f4eef19bd' 
  AND token = 'znUPSXci6BcDopCLzr6Wi2KJteLK9vLQ73frLrWeSuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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