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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13b1aa4e728e00c98701f55639f3ee72cfce03d89047aaf2456905f8fc548ee' 
  AND token = 'OUG0/gh14ifLJ7gI/SjIuG+18+2Vr4E5qWe+XuhdI8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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