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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e28eda8704f264a48fa73eb89db052773e66db64d366156a2c08459f8d1ee9' 
  AND token = 'sUSrMVOSBsiKEueowAIphrayfR8Jj9nlNqAncQHiVpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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