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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044b2e0c8d4c568df74ea8d921626f4445aa9bc3a7bb8f53c0168a8582d3744c' 
  AND token = '2m+SisFjp2dl6iYykll7PFE31x8bgzke4RRbGHhbPMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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