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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0863fe712c5fe8708c04ac05a2de7ebd909a94f0583dc656c41b4d3d66d7c333' 
  AND token = 'sB792in4XoNHvH/oSGjsDaM09ZregfuIykYR2p/L6NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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