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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979df294f33455f93bc3d81f24844043e5426eb970d6adf52a4d6d7059110b1c' 
  AND token = 'yPHraIitPsGIopQDvNLm66DPRlSYHNIk6ARRyPTj9qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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