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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f5ce3de9acd2f4715c21af2e98d59feb140e91be2c9e194985c62787f796a08' 
  AND token = 'JN9YZJRyxY+agJ+8jYX0gE5YcqvhX4cB4J5y2TzQkGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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