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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c924add4ba07dd46606406f92b94d91bc5891fab40bbcf51af857131efb35da0' 
  AND token = 'p/K8LWT+EA4yQfV/ZJAFbUgmmTadI+xAkVTgkC1fv18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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