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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ed651f8bf1bf7099c31ab265e0476b54431f30a653fd9a3ea73db46aeeef86' 
  AND token = 'CJJwhiPBkoaI2qz5dkUBz3u5uY/Gh7NXP40z4RARBlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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