SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f312cc3ef8719b69972cd6f2ca64e1f26448f5f69b3fa20254fc3e871fd8b7' 
  AND token = 'gsE0rD0cXDWGtR2vrntLFIyiYiwutIV/c6+kABUzBZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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