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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c532f626213f18dfb1b8ecdb592efe0bc5e6533dff49d1ef62148ff1fe84fadd' 
  AND token = 'cvgZxl0F43hodZ6BSsanGcSPPv+2OPy9RVt/xJBjs2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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