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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa2cf76eb66dfdbbb2e5b94655db8b462c10a484822b04ff8dd9dc862c06662' 
  AND token = 'PXbniKFVHx92DpK2WXF9Lni7wJ89qGY7SqDyFVeQ8H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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