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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b91e81ed579eacc84d7b38042fd8d784fa8b2493f52d3604a16a9ce7cf1aba3' 
  AND token = 'KO+EOo2dZsliTyQ1zoyvxFXzLtOgZdc00ef1LZ23MRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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