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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdb3afc3f0ab469dbee62759275c60ea64934221632242f8d724a6a8cdda4bd' 
  AND token = 'f1R+0efW+8HpaEujMiGgZjdyFx/YiX/T52i8GTJWohA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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