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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295695f20a69b14ec456517ad76b70ada39ec93c9545ea6022fbe5e9871d130d' 
  AND token = '3qGZVa9PwZKL+lEYXiHtjjkBaCBN4Mum9e/6eSRCRXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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