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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212d23e3287c8325d450d6b9905f9503057ded9578d3e03bb3aba797675011f7' 
  AND token = 'qmDCn8V3FJAnzBKtanQnFTdy29g0w5/tavkEWFVf5Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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