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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d286aeb76b35b1d9e0cbaa28181ec400051c5b8525012ca7b4f98952adf650' 
  AND token = 'XzWVA+n9U4IVfiPWgDdENQn/2WkzUmcn3zexVq6HAag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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