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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82b2c10e70620ddd62529e186d1aee3eac9f4197eee52bf4302b0746fb05570' 
  AND token = 's5gGWJ46pLcXwhrSg1AtI8BchCVJSGNB0BDZmdojGXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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