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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb292e13dea5e09f9e389f1f38df2f0fa4f8308a514cf94ddaa9933312847ac' 
  AND token = 'dBZRohOqxuWo6ysiVVTpRXay72X7tRBut/+bBSZt9wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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