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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2514b3a4f91e7d8e0f1a992f3cfb987ebe6289a128e93eb9daa0ea987fe4d060' 
  AND token = '7k3lUIriuIF71f91/2E197W7XDTKdznbiQLaZvnhmMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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