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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aad292071c6f0b8f844957f651ff47004d20d34b14e0756dc30e7340dddfa83' 
  AND token = 'Wu4GijOZh2G6cp1FpR0GU+5tbwQk9rJP5loEblSylLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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