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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97be641cd9bdbeb7695830660e40027f4ea0f2022c6aef3702cffe76c970ad80' 
  AND token = 'ZiEcggueAPhXAxlucqDADPLcOnksgJqH3u0qc42qEfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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