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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92906518150b1cc3a1fe2355706096ebf608aeacb5bc3aa2cddc4417b9e268a' 
  AND token = 'qQQIMGa6jr2lL0ude8SvEXESAroBN+NHOtTTt1iujr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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