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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b07cb134112fa92e07ef3b877db7a65023f76a28b445ed33f6d2b6b3fd3a90d' 
  AND token = 'ZZeUrp5gnINkH2q81BF0UxoQEFUBYZbT2NxA804+Bjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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