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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb03f26a6e890e03fea3171e6f77ef9ff1ca7668b8f7fbe9afa43bb7c06a756' 
  AND token = 'w9SFbEE8coj1hekCTBbABqPlpJ703/PYxreFU93a2PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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