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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96ee033dc95d24c63e038cc83dd5fb5dd8a81022e7dfe6105f6e86900c003da' 
  AND token = 'JKzGZroK/oxFPCv7Kl3HCYfSV970+GUyejU/9PIm+l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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