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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126a482dbf70e9f01432b81d0b20455c4c7720844ceb60599842f59654a70b03' 
  AND token = '71CXRI2S3HNEoR/O7UBhIC1aY+yf8rS8HApB16cTKbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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