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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e9dcb495533f98512c711f4af39ad4e190902f95a29a81f1a0b16dd4944694' 
  AND token = 'Q5Q6HCzQHvQraH+eY3jSCi5Nu7JYxPOFlp0MZ7aYqtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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