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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635d3b425e5917f2bed5f8cc31f4380966aa31661ad8cd3c98f61dc4c36c9c84' 
  AND token = 'k87R647hE5JmLuKIFwlvWiHcmv45iOJkQGz0D6XjSzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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