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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29fc92a1c195982752bdf23ec36214ef74a017411c909183828905268ad17278' 
  AND token = 'RggjTUzqSryvnSUH7o3bOTThpTsF0M+IbAtF/qnGQHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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