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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88810b9ae50dc10a4444d0058edadf561ee192a2c19a26d52116542e94f527b9' 
  AND token = '9WE1Jo6LWkiswdhSHwceK3B/eHDdAoyan4SrYAkrpMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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