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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633aece941f847b56a9ddec39ed77c1c4a7b125375bb7eea773bd97ae1164de6' 
  AND token = '6UjXRgytRsl4n/vsaojV99rlfuQ6Qtui/akCIyPC1oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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