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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617ea8975d2eedac46e99d9171c4b0d2f1d2ac2dd0192d54659e4ca7af6295b3' 
  AND token = 'jobF7ry3fZMwtvw4MvArVQMIGJYYGNIoNNmqBZP73nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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