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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b332238dff93029bcb1c34fd92e5f03b3eefa80ba6c6d9e61d71aabea5c150' 
  AND token = 'yewkPF8dIAdmeAK5Ipw/ajc/daeTL9xruO9OtT3cZ9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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