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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c394f6d1bdf1a1e38e59122995934ddca8829db2e36ac91c1523d533acdebb10' 
  AND token = '3ez3W7Y/F9d0YZygSMBuEowFt7dYqLOpQOIa+cWjooY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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