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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f8ce3d60a3c2d2216f150b8419d17d25b7334ac3efdfcb4cfcd1de9e6221b9' 
  AND token = 'Xn0g6nS5vH7MkZWCGdVS9vDnvutAkr9ovdbgi9UEOuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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