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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d925fff1d24547ca7afbd1e2611d517d73ca68776a94ecc7b836a05b0d7e77' 
  AND token = 'Z/e22oOBQ80Ek7CIc49Z4vOPYT4YK3/AlVhNVyxOuQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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