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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282895d5d28b10ec8bd3bea211eccebe623c50711aa6e10f149dbde12dbbb3bc' 
  AND token = 'xqPhD+gOY/MxEBInI+qSXL6o7vtcbHHOShHEE4OHPq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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