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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bbf55e20d7c4da4e528ca1aa78af455113f6de85824ebbe729b005f0a5e5bcf' 
  AND token = 'CiP+mdvN5HvsfzGOrLWv0a2KoT8mYEjWij5AXuYasm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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