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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073ff6adcddf3ae0fe56a533940a88d7e150b4831b3e3d2d2b7142d41c24eb37' 
  AND token = 'FWgBS/jM4OU++boFG7JkS9Tk5Rng1NFkmVsZ3uChuX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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