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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca5ea484aee07dd6e5d528ad9b41d282bde1c6df26933efae0fb3dbd03bb2ed' 
  AND token = 'D3KpZsm2ktMfDZ8uEi02MCLXpurFlU10IUyNTEeawmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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