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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c587af3d1a89ba5faf3769b9a0b88798c794878033085461365907e6c1acd608' 
  AND token = 'in3xsSRUP8JryE1oReWclABXekpbjrwyAkul8DaYU2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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