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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82a3ac8dbb26794827b4bb55f0b3231b13b52bdc64b27c6df4346836addd0eb' 
  AND token = 'ouiUJDCq9i2c4VGUmTyhANjMLhZs+DCPV1x93csmV8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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