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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7412c4c315aac93d3d5dc2e7262a3e89340c07abd80b94c7adfc9231f46409' 
  AND token = '263uokGdSmpGO0MQI5ilfC2Gv8vWhmU2pUKtZwwnqCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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