SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba162cd0623093538c72a05d752aae233cbc02677d4bfe8ce07fcb97f13255b' 
  AND token = 'R+uuhlFSMHIKwq6O0L+pzgkfJAvljmt/HH+k5myNvVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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