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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401bea515bd50352b2a7de082a2286ab04fa23633f8c25a1f12853bd33c4d8bd' 
  AND token = 'CGsS6JbF0bNPfoIfU78+8AA6Xz0IpHADqzYGfqoR9D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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