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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c9e00b50acb3275a826ccdcbb2f58556c76aea59e941adaf46835d7d12149c' 
  AND token = '6G0xd5rW0/gdmYVANreUDCaQtlcBiC/DwFOKtv77flw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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