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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58c591ab0dbbb47cab16eca4fdd9b106a1de91b7203f693de39cd6b736c85e5' 
  AND token = 'qo4bOTT9aNUlV2uMTZw1WFkX5FG+fV+KnPZk/boliw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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