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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178d899726f3732b17e0d3bed865992edcd988a395f467c0923ecf331094b31a' 
  AND token = 'NjGfcwsApvCpylU8gwz9cTtIxZjLW+fx0BQ85Nu0Vac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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