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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03552e7180565dee319f42045e5e6c6c88b0a054b7ea251e89530efca7cd6e0c' 
  AND token = '7x+XEHmKCW1BJgmvtXPWcJPUzmIlb7idkNIB/OCsGKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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