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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7462d4479852d1b1512d783e2367e489360cb9074bd458e7aca83132bf54274' 
  AND token = 'rwbYI4hLNtU16eHf/GokiTWUZ6tNspq/9f6AtJ0d6kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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