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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5adfdcdaa037b2ffbc9f47acd0d9e38a7b49746910b7ff1705e18eeb95d510' 
  AND token = 'vcIYdYR7Mnzlfznblty3V0QSwWPaSeEQdFs2R2bU8qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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