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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcece8ebebf0340f5cbb00c153e2e72b26535327ee86ecad25ca1a67d3d26e7a' 
  AND token = 'fhyYpdTmeQrjvC9z/dsNShrzuJppVcKKUy4kqRIvIrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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