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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1092084108acafa9cf1a625ed3bc6f85dbd17b89efbc049b09ee11144491e3d4' 
  AND token = 'RuQNjv0rMv/q9CwQ9Tv/Cknt32KGiWEPArue0izfkoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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