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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9ac1fe7fe01d2ec7af87fe5a69020bf2c2aa7d5d1f89fcdf477347ff71304d' 
  AND token = 'WVAW73xG676rN3aUmlqhuwF6tlgVINeSo3g670MiX8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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