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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be7dcf8b005283d63ab0bd3319e5cf0c4b47a7cf05fb8ba537f85bdc33ef03a' 
  AND token = '+TapGmZcZ9oq8wp9r+lP+skU4tDwPmEb3HrTi2XauaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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