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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe35d2817e459451ea6df1b489f3e4cd7dee6c36b75b9e5e8a61c6bce7b793f' 
  AND token = '+AW7gRNHPPEWQWIl5ku0QlZza81/N2Fu9E+/E+ygKno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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