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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6965ded3a7175492d4c099e38a691e71bdc2da5926271ddd9705a8511e837272' 
  AND token = 'IIGp8EdoZuZR0odloxfZSGB2k5AzHdCA+PQDtA62DQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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