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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b1657884a8de7b2fd7ede4eb1201f34937a2007235a99162539cac8b5f3b1b' 
  AND token = '8ebDH5qyZewsa+JQaXTCvEOhRW1YI9mUilI3pK1DI6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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