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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e7fb3c8d8652cbb0f3879e75a5280445dda6a730cbeef7b31730974c5eac5d' 
  AND token = 'dV+m6ndxpfqUe0a7JACMsNcZNW+YELTPldJYUCx1Q88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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