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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac0b13657ed5ff3a9e40af7d80153e2a9e8f34ba127d68a9d50886c4c8fda9e' 
  AND token = 'xXRfFUc6gwcIa3Qjn8WxiwoTLfRowSKYuVG7sn/zhiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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