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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a593fbd9036d5e51a317638c60efaf665c4c8aafda7db6f015562321b263a6f2' 
  AND token = 'DWEVydVTUd43EPtXRqnr3f0TYGgiUro7s0fUFSWExiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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