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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de194d7e74728e92c3c5614da3796a415909c669fd9ea60fc4eed174e28a7a19' 
  AND token = 'PtyPeyPDgaF1tvju3AvCBGTsRxU3sf7uhcjH/dpto3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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