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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a8012978a94cecb0913ec31d835ffd881151068ba21cfef19c9d8a08914b30' 
  AND token = 'c9dLG/KpA7CUTNkJb7CjSD2odNkHhjlWk3CiR1raQhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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