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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9111d5fe716a9c5fcac3f7e1d268d1b77f9f48fd040b37092dfecb68acabfebd' 
  AND token = 'SXpCo9j9i+ntwMfFzR3eLx0ejSBezEhPKWM53ULHlBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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