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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538174f01d9404b1b7df7a7e9020c539c3b1b6ca627904d9395fedfd649bf630' 
  AND token = 'jla+3fdDCrJjenfX53y4ItclIfZZYWcyN6PMZ2AY92A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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