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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37d739504e2c3c636073dfed1cfb8ac3fad555d9c256897d3ff056619650a79' 
  AND token = 'zmoNgUJaFc2e6BRtxTY2K2y1CXPAlIK7v5viHdDrug0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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