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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1907e39c5d566b905536c9f157a98230fd3b824061964f9d1e9a099f94b9be0' 
  AND token = 'SrIvghBQr7yZBmVRTkzv86IGzYDnBFWCU8tRFIEi4VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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