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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fd1caa03400147d51abccb962bad01fd30e0d8f1cdc1db336657a78798513a' 
  AND token = 'Y3qdxWuAqpj19V1dnOd2DdOZBgbz7pVei+2D5kCt9GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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